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(No Model.) 2 SheetsSheet 1.

G, DAVIDSON & R. A. DIXON. CIRCULAR KNITTING'MAGHINE.

No. 427,465. Patented May 6, 1890.

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-QZMM 6' W (No Model.) 2 Sheets-Sheet 2. G. DAVIDSON 8v R. A. DIXON.CIRCULAR KNITTING MACHINE. No. 427,465. A Patented May 6, 1890.

UNITED STATES PATENT OEEIcE.

' GEORGE DAVIDSON AND RICHARD ADDERSON DIXON, OF PARIS,

ONTARIO, CANADA.

CIRCULAR-KNITTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 427,465, dated May 6,1890.

' Application filed August 6,1888. Serial No. 282,068- (No model.)

To all whom it may concern:

Be it known that we, GEORGE DAVIDSON and RICHARD ADDERSON DIXON, bothmanufacturers, and both of the town of Paris, in thecounty of Brant, inthe Province of Ontario, Canada, have jointly invented certain new anduseful Improvements in Circular- Knitting Machines, of which thefollowing is a specification.

The object of the invention is to design a simple attachment by which anauxiliary thread is instantaneously thrown into connection with theneedles should the ordinary thread be broken or subjected to an unduetension strain; and it consists, essentially, of

a tension-lever carrying the ordinary thread and supported by a springof only suiiicient strength to resist the ordinary tension on the threadin such a manner that should the tension be increased beyond the desiredstrain I the said lever will drop and in its downward motion cause apivoted thread-carrier to bring an auxiliary thread into contact withthe burr or sinker wheel of the machine.

Figure 1 is a perspective view of the mechanism involved in ourinvention set for the knitting of the ordinary thread. Fig. 2 is aperspective detail on an enlarged scale.

In the drawings, A represents the needles of the machine, B the burr orsinker wheel, and O the carrier for directing the ordinary thread D. Thecarrier 0 is supported by a bracket E vertically adjustable on the postE by means of the slot 1) and set-screw c, this being a common method ofadjustment. F F are two jaws, one jaw F being rigid with said-bracket,the other jaw F being secured to the bracket by a screw G, the looseningof which will remove the pressure of the jaw F against the carrier O andpermit the said carrier to be adjusted longitudinally in order to directthe thread D toward the proper point for feeding it into contact withthe burr or sinker wheel B.

H is a Weighted tension-lever pivoted in a suitable bearing formed uponor attached to the carrier 0, and J is a spring projecting below or heldin contact with the lever H with only sufficient force to resist theordinary tension on the thread D. This thread, it will be in theiradjusted positions.

noticed, passes below the lever II and is supported in a loop formed inthe finger K, which is attached to and extends below a head formed onthe lever H.

L is a lever pivoted at a and bent so as to extend over the thread D,the said lever L be ing preferably made of light wire, so that it may bereadily supported by the thread D without interfering with the freepassage of the said thread throughthe machine.

M is what we term an auxiliary thread, passing through a loop N, formedin the end of the rod 0. After passing through this loop N the thread Mis carried over a notch formed in the end of a finger T, carried by thefree end of the rod 0, as shown in Fig. 2, and projecting below the burror sinker wheel B, so that a loop of the thread will be carried belowthe said burr or sinker wheel. A rod P is connected to the rod 0 or tothe rocking shaft 0, to which one end of said rod is connected, asshown, and extends back to rest upon a bent finger Q, formed upon orattached to the lever L. WVhen thus supported, the thread M is heldclear of the burr or sinker wheel B. Should the thread D break, thelever L would instantly drop. Consequently the bent finger Q would becarried away from the end of the rod P, thereby permitting the said rodto drop and cause the rod 0 to rise and carry with it the thread M intocontact with the burr or sinkenwheel B. v

To prefer to make the rods 0 and P independent of each other, althoughboth must be connected to the same pivot. By making them independent ofeach other they can be each longitudinally adjusted to suit therequirements of their employment, (see Fig. 2,) set-screws 19 beingprovided to hold said rods A spring B may be applied to the rod P forthe purpose of forcing it down when not supported by the finger Q, or aweight on the end of the said rod P might be substituted, as shown indotted lines in Fig. 2.

Our invention also provides for the auxiliary thread M to be thrown intoconnection with the burr or sinker wheel 13 should the strain on thethread D be greater than the desired tension. In this event the tension15 of the carrier 0.

lever H will be forced down past its spring J, and in thus falling, asit carries the lever L with it, the finger Q will be carried clear ofthe end of the rod P, which will thus act in the same manner as thoughthe thread D were broken. When the lever H is thus caused to fall by anextra strain on the thread, the weighted head on the said lever strikesthe knife U, carried by the carrier O between the pivots of the leversH, and L and rods 0 P, cutting the thread D and leaving the work to befilled in by the auxiliary thread M.

It will be noticed that the thread D passes through an oblong hole 0,formed in the end This oblong hole is made suffieiently large to permitthe free passage of any ordinary chip or burr usually found on yarn. Bythus forming an oblong hole we avoid breaking the thread by a chip orburr being held in the hole.

In order to prevent the rodPfalling farther than is required for thepurpose of bringing the thread M into contact with the burr or sinkerwheel B, we provide a stop V, project- 2 5 ing below the rod P andvertically adjustable upon the carrier 0 by means of the screws dengaging the loop 6 in said stop.

. WVhat we claim as our invention is 1. The combination, with thecarrier, of

3 the tension-lever pivoted thereon, a spring supporting said lever andof only sufficient strength to resist the ordinary tension on thethread, the lever L, and an auxiliary threadcarrier pivoted between theend of the carrier and the tension-lever and provided with an armnormally supported by a finger on said lever L and the knife U,substantially as shown and described.

2. The pivoted rod 0, having a loop N formed on its end, and a finger T,projecting from the said loop below the burr or sinker wheel of themachine, so as to support a loop of the auxiliary thread below the saidburr or sinker wheel, a rod P, connected to the pivotof the rod 0 andextending to a point where its end may rest upon the finger Q, which isconnected to the pivot a, in combination with the lever L, carrying saidfinger Q and connected to the said pivot a, and designed to rest uponthe ordinary thread, substantially as and for the purpose specified.

3. Alever L, a tension-lever H, carrying the ordinary thread andsupported by a spring J of only sufficient strength to resist theordinary tension on the thread, in combination with the burr or sinkerwheel, the knife U, and a pivoted thread-carrier arranged to support theauxiliary thread below the burr or sinker wheel B, substantially asdescribed,

whereby any excess of a predetermined tension on the thread D shallcause the lever H to fall, and thereby impart movement to thethread-carrier and simultaneously cut the thread by the action of theknife U, substantially as and for the purpose specified.

4. The combination, with the post E, of the bracket E on said post, thejaw F, rigid on said bracket, the jaw F, adjustable thereon, and thecarrier held between said jaws, substantially as and for the purposespecified.

5. The combination, with the tension-lever I-I, carrying the ordinarythread and supported as described, and the lever L, of a finger Q,carried by said lever L, the rocking arm 0, carrying an auxiliarythread, the knife U, and the arm P, rocking with said arm 0 and normallysupported by said finger, substantially as described.

6. The combination,with the tension-lever H, carrying the ordinarythread and supported as described, and the lever .L, of a finger Q,carried by said lever L, the rocking arm 0, carrying an auxiliarythread, the knife U, and the arm P, rocking with said arm 0 and normallysupported by said finger, and the adjustable stop V for said arm P, andthe screws holding said stop in its adjusted position, substantially asdescribed.

Paris, July 23, 1888.

GEORGE DAVIDSON. RICHARD ADDERSON DIXON.

In presenceof (J. M. FOLEY, J. N. YOUNG.

